vim: update plugin vim-open
vim: include plugin vim-help-stash
vim: fix pandoc customizations for multiple buffers
vim: switch to airline for status
vim: improve + add fast buffer navigation maps
vim: set file explorer view
vim: remove unnecessary call to helptags
vim: switch to ctrpl, keep command-t map
vim: switch pdf viewer for tex
vim: config youcompleteme autocompletion